I have this seperate class to fill a treeview from my database.There are over 33000 records and when this class runs, it takes almost 1 minute to finish.When i run this query from the server it takes for 5 seconds to retrieve all items.Is there a way to optimize this class?
Option Explicit On
Option Strict On
Imports System.Windows.Forms
[code]....
I'm designing an app that resets permissions on folders so I've made a treeview that uses GetDirectories to populate itself with all folders on a user's computer. The TreeView has the "checkboxes" property set to true so the idea is that users select all of the folders from this treeview that they want to reset permissions on and then click go.
So once they click go I need to loop through all nodes in the treeview and all subnodes etc and test to see if they are checked, then if they are I want to add each node to a list and then in the next routine I would loop through the list and reset the permissions.This is what I am doing at the moment but I keep finding that the objects added to my list are duplicated.For example if I select C:Test and C:TestTest2 in my treeview then I end up with my List looking like this:
[Code]...
I have to map a directory with all subdirectories and their subdirectories and so on, all in a treeview.
I have this code but it has a "small" bug, is not done well.
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I have a problems with my application..
1. collapse and expand treeview when i click plus sign (+) on treeview, treeview didn't expand subfolder but when i click image, treeview expand it.
2. showing path that i check on treeview when i check the treeview then i'm click the button, then return path that i check
This is my code..
I have a VB 2008 Express program that uses a sequence of functions to move a set of image controls randomily until they meet some criteria as returned by a function, named here Passed().The random placements can result in an unsolvable solution, i.e. an infinite loop; So I've implemented a timer check that triggers just longer then the typical solution time (~2 seconds). Assumption being that any attempt longer then typical is likely headed to oblivion.
Upon timer trigger I attempt to reset all the images to a known location and simply recall the preceeding functions to again try placing them until they meet my desired outcome.I believe I am encountering an out of memory type error, due to an apparent corruption of the display (great big white area appears for no apparent reason and program never returns without manual halt). Program does appear to restart properly a couple of times before this 'lock-up' occurs.
Example of my code,
Public CnameA, CnameB as String
Public Cmax as Integer = 10
Private Sub Form1_Load(...)
[code]...
Is it possible that the calling of New each time might be filling up the available heap / memory (there are a lot more images then the 5 demonstrated here. I am unsure how to clear it and even if I did would clearing the memory associated with New Point () cause my images to not be displayed?
How best to cancel/kill a recursive folder copy? I am looping through a number of pathnames in a list box and then recursively copying all files and sub-folders to a backup location. Suppose the user wants to cancel for some reason. I have checked that I can detect a click on my "cancel" button in a timely manner (DoEvents sees to that) but how can I stop the recursive file copy without ending the program? [code]
View 5 RepliesI am using the following Recursive Directory Copy code, and am having a strange issue. I am using this to copy and directory and all subdirectories and files to removable media (flash drive). Everything copies perfectly fine except for 1 file. this occurs on the same file every time and sometimes the file copies successfully, but other times it does not.The problem file is a 7-zip archive with a .7z file extension.When it does not successfully copy, the file is only 8 bytes on the flash drive.[code]
View 5 RepliesI am working on networks. My work involves finding out what nodes connected to a specific node (Source node). I have developed a code which does this using a recursive function. The only problem that I have I need to record the path. For example shown in the picture below, my program give me the following results:
1 Node 3 is conncted to 1 via 1
2 Node 5 is conncted to 1 via 3
3 Node 4 is conncted to 1 via 1
[code].....
I'm using a recursive search to find all of the controls on my form and then do something with those controls once I find them.This is the basic layout:
Form
-----CustomPanel
----------PanelChild
[code].....
I have made a form that consists of textboxes nested in groupboxes nested in tabpages. I want to check if all textboxes are empty in every groupbox and even if the controls from a groupbox in a groupbox are empty.When they are empty i should not create an element string for my .xml document.Below is the code that I have at the moment. I call it with the form as the parameter.
Public Sub recurringControls(ByRef ctl As Control)
For Each c As Control In ctl.Controls
If c.Controls.Count > 0 Then
If c.Tag IsNot Nothing Then
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I used to have the following code in a module that returned a string array to my main Form and used .addrange to put them into a combobox
Friend Function getPrimeContracts2() As String()
Dim i As Integer = 0
Dim count As Integer = 0
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Here is an extension method you may like for use with VB.Net 2008 / VB.Net 2010 and onwards.Instead of doing the following:>>
Dim newList As New List(Of Integer)
newList.AddRange(list1)
newList.AddRange(list2)
newList.AddRange(list3)
newList.AddRange(list4)
i was trying to paint a row of a listbox item but ppl said that listview item is much better than a listbox and has the ability to paint items, what i couldnt get it to work however is to add an arraylist to the listview what ive tried was the following:
datasplit.AddRange(progressload.Split(New Char() {"'"c}))
Dim items As New List(Of ListViewItem)
items.AddRange(datasplit.ToArray)
[code]....
Is there any easy way to add an arraylist to listview?i forget, is there a possibility to make listview order items like a listbox? i dont want from left to right then down then left to right then down... etc I want them to be top down and keep like that no matter the dimensions of the listview.
I'm having an issue with updating a couple list boxes in the form load procedure. I have an array created from a MySQL database, and when I try to add that array to more than one ListBox, I get: A first chance exception of type 'System.ArgumentNullException' occurred in System.Windows.Forms.dll
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How to Remove the Initial path from the listbox so it just displays
Film1
Film2
Was looking around google and messed about with it in college but could not find it.
[code]The scroll bar appears so some thing is being added but nothing is displayed. The items are in the annon member.
View 5 RepliesI am trying to populate an ArrayList using the elements from a DataTable. I know I could do this using Loop, but I am trying to figure out how to using AddRange.Here's my code:SomeArrayList.AddRange(SomeDataTable.Rows.Item(0).ItemArray)
The problem is that I can pass the collection except for the Zeroth element.
This is the collection I am trying to pass to the ArrayList:
1. Dog
2. Cat
3. Bird
This is what I got 1. Cat 2. Bird
I have a node that is called AutoEnabled. If this is true the check state of the listviewitem needs to be checked.
vb
m_list.AddRange((From node In Doc...<Join> Select New ListViewItem(New String() { _
node.<AutoEnabled>.Value, node.<Chan>.Value, node.<irc>.Value, node.<password>.Value})).ToArray)
I know how to get the boolean, just not sure how to parse properties.
I'm running out of walls to bang my head against. Okay new windows form with a textbox, button and TreeView Populate the TreeView.nodes with the default nodes via properties
[Code]...
I want to click button1 and have the name of the childnode? Node3? placed in the textbox. Not via selection, I can do that. But via index or item number. The code I have is as follows
[Code]...
I want to be able to add a range and get updated for the entire bulk. I also want to be able to cancel the action before it's done (i.e. collection changing besides the 'changed').
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I need to order lists of up to 100 addresses in optimized order. Is there a way to do this since getdirections is limited to 25? i don't se any way around this 25 limit. Is there one I'm missing?
No I'm trying to use MapPoint object model but it crashes as well with this many waypoints. Here is my example proof of concept code from Excel:
Sub OptimizeRoute()
Dim objApp As Object 'New MapPoint.Application
Dim objMap As Object 'MapPoint.Map
[Code]....
I had been working on a project that would generate a loan schedule.
But, It needs to factor in specified holidays and weekends.
Now, when running with a small 'term', it seems to work fine.[code]...
Consider this
bar = 1
foo = <1 or 2, depending on previous code>
if foo=1
while bar <= 5
[code].....
What I want to know is, is the compiler smart enough to optimize away the (apparently) repeated tests for "foo = 1" since foo is not modified in the body of the loop?If so, I might use the second construct since it is semantically equivalent (I think!), takes less code and reduces indentation levels.
I need a list from OldGuids that are not in the NewGuids, so I used the Contains method, the problem is that it is already running more then half hour, is there a faster way? or how much longer would it take about? [code]
View 2 RepliesIs it possible to use a string as an array? I mean:' I have several arrays
Dim a10() As Integer = {530}
Dim a15() As Integer = {370, 231}
Dim a20() As Integer = {305, 176, 126}
'I declare a variable as a string and I assign the name of an array to it
Dim tablaalfa As String = "a10"
'I retrieve data from the array using the name of the variable instead:
lbl1.Text = tablaalfa(2)
I guess it doesn't work in this way?
vbc.exe has something called /optimize switch right. If I enable that what are the optimizations the compiler can do for me? The MSDN documentation just curtly says 'does various compiler optimizations'. Where can I find the complete quantified view of the different optimizations that actually goes into.Here is the thing I am pursuing this route. One of the code blocks in a module I am leading has a lot of delimited array manipulations. I believe this is going to be a heck costly in terms of string memory handling. I am looking to see if I can retire them by way of simple properties or methods so that the compiler can internally do something like our c++ inline functions making a best win-win offer in terms of both memory and processing time. I admit when the compiler translates them as inline function, the JITed code might be big in size right?
View 7 RepliesI basically want to remove the formula from the cells but want to retain the calculated values.
SO, I implemented it easily and it works great but REALLY SLOW. (About 2 mins for 1800 cells)
I have : Dim col As Excel.Range = getRange()For Each cell In col cell.Value = cell.Value Next
I tried to do this to the first cell and then autofill the rest, but that copied the value of 1st cell to the rest of the cells in column.
Want to dump a fetched table to a excel sheet. [code] I am new to data fetching and ADO.Net concepts and just got it working.But. This seems to be very inefficient and lame to me. So, can you help reducing the complexity and may be improve performance ? A totally different (Better) implementation is most welcome !
View 2 RepliesHow can I Optimize my own code written by VB.net? Is there any tools for it? Does Visual Studio have any one? What's your suggestion? I use VS2008 as my editor.
View 1 RepliesOften it is very usefull to save data as a class by serialize and compress it. From few experiments I have noticed that
Class A
Public name as string
Public List as new list(of string) <---- empty
End Class
Class B
Public name as string
Public List as list(of string) <----- not instantiated
End Class
If I serialize and compress the 2 classes the class B uses less spaces once serialized and compressed. This suggests me that if a class contains a list that is instantiated but empty it is better to set that to nothing and reset as new when it is decompressed and deserialized. Is there any dll that optimizes a class to be stored (serialized and compressed) and restore it when it is decompressed and deserialized?
